Look at the conjugations of a few stem changing verbs. identify the conjugations that change stem and the ones that don’t. sometimes these stem-changing verbs are called ‘boot verbs’. can you think of why?
yo: juego
nosotros: jugamos
tú: juegas
vosotros: jugáis
él/ella/ud.: juega
ellos/as/uds: juegan

For this question, it will be important to use the words "mejor" (better), "lo mejor" (the best), and "lo peor" (the worst). while "mejor" is comparative (you are comparing one thing to something else), "lo mejor" and "lo peor" are superlative (there is nothing else better or worse than what these words are describing - there is no comparison).  you could say something like: la música rap es mejor que la música clásica - que es lo peor - pero la música rock es lo mejor de todas las formas de la música (rap music is better than classical music - which is the worst - but rock music is the best out of all the forms of music).

Sprry can't , this is suppose to be your expirience and i dont know what you expirienced im awfully sorry